1. Phytopathology and Tissue Culture Alliances
2. Anatomy of Resistance
3. J. G. Berbee, J. O. Omuemu, R. R. Martin, and J. D. Castello, 1976 : Detection and elimination of viruses in poplars , pp. 85 -91 in 'Intensive Plantation Culture'. USDA Forest Service General Technical Report NC-21.